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Abstract:
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Abstract : The aim of this study was to analyze the contribution of caffeine intake, through the chewing gum, in the aerobic and anaerobic performance in actives militaries. In this study participated twenty militaries from the Brazilian Navy, students of Escola de Aprendizes-Marinheiros de Santa Catarina, male, physically active, no medical restrictions for physical activity and practitioners of military physical training. The sixteen subjects performed a randomized double-blind trial design, in which they performed on the same day the TCar test and a test of RSA, with five minutes interval between them. After 48h these tests were repeated. Subjects consumed each day, five minutes before the TCar test, chewing gum containing caffeine (240mg or 3 mg.kg-1 body weight) or placebo. For repeated measurements to assess the effects of caffeine on the performance of the RSA one two-way ANOVA analysis (subjects versus time sprints) with repeated measures, on both factors was used to assess the effects of caffeine in the performance of the RSA. For post hoc analysis the Bonferroni test for multiple comparisons was used. To the effects of caffeine supplementation on FCMax and Peak Velocity (PV) and RSA data (fastest time - MT, mean time - TM, slowest time - MS and fatige index - IF) were determined using the Student t test for paired data, with a at 0.05. Furthermore, the magnitude of the effect (effect size - ES) was calculated, and was classified according to the Cohen (1988) criteria. It was found significant difference in [LAC]RSA (CAF = 13,26 ± 2,39 and PLA = 11,71 ± 2,49, p=0,02), with effect size equal to 0,6 and moderate classification. No significant differences were found in other variables (PV, HRmax, TM, IF and lactate concentration in TCar - [LAC]TCar). Thus, it was observed that consumption of caffeine alters the [LAC]RSA.
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